Unit 2: Exploring and Understanding Data

Question 1

Answer 1

Symmetric and Unimodal

Question 2

CUSS

Answer 2

Center, Unusual Features, Shape, Spread

Question 3

Contingency Table

Answer 3

Used to compare two categorical variables

Question 4

Marginal Distribution

Answer 4

Found by looking at the “totals” of one variable in a contingency table.

Question 5

Conditional Distribution

Answer 5

Found by looking at the individual cells of a contingency table.

Question 6

Relative Frequency Distribution

Answer 6

Means to find the percentages instead of the frequency

Question 7

Types of Categorical Displays

Answer 7

Bar Chart, Pie Chart, Segmented Bar Chart, Frequency Table, Contingency Table

Question 8

Types of Quantitative Displays

Answer 8

Dot Plot, Histogram, Stem-and-leaf Display, Box Plot, Scatterplot

Question 9

Mean = Median

Answer 9

Data are Symmetric

Question 10

Mean < Median

Answer 10

Data are Skewed Left

Question 11

Mean > Median

Answer 11

Data are Skewed Right

Question 12

Median and IQR

Answer 12

Used when data are skewed

Question 13

Mean and Standard Deviation

Answer 13

Used when data are symmetric

Question 14

Standard Deviation

Answer 14

“average” distance the individual data values are to the mean.

Question 15

µ

Answer 15

population mean

Question 16

σ

Answer 16

population standard deviation

Question 17

Fences

Answer 17

UF = Q3 + 1.5*IQR

LF = Q1 - 1.5*IQR

Question 18

Q1

Answer 18

Quartile 1

25% of data less than Q1

75% of data greater than Q1

Question 19

Q2

Answer 19

Median

50% of data are less/greater than Q2

Question 20

Q3

Answer 20

3rd Quartile

75% of data less than Q3

25% of data greater than Q3

Question 21

Two categorical variables are independent if…

Answer 21

The conditional distributions are NOT different among categories.

The segmented bar chart has different percentages.

Question 22

Advantages of Stem-And-Leaf

Answer 22

Original data values can be seen

Can still be used for CUSS

Question 23

Disadvantages of Stem-And-Leaf

Answer 23

Not good for LARGE sample sizes

Can be tedious to make

Question 24

Descriptions of Shape

Answer 24

Modality - Unimodal, Bimodal, Uniform

Symmetry - Skewed Left/Right or Symmetric

Question 25

Variance

Answer 25

Square of the Standard Deviation

Question 26

5-Number Summary

Answer 26

Min, Q1, Median, Q3, Max